<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Margin</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: pink;
            margin: 10px;
        }
        .header {
            width: 900px;
            height: 200px;
            background: pink;
            margin: 10px auto;
            text-align: center;
            line-height: 200px;
        }
    </style>
</head>
<body>
    <div></div>
    <div></div>
    <div class="header">
        <span>里面的文字</span>
    </div>
    <div class="header">
        <img src="../img/btn_secondary_pressed_90.png" alt="404">
    </div>
</body>
</html>